I don't usually post on these forums but I do have an opinion if anyone is interested.
I owned and ran my own buy, sell, trade video game store for many years before I was sent to prison. I have lived through quite a few console launches and here are my thoughts on the Wii-U and Mario titles in general.
OK, so we will start at the N64, this console sold very well here in the states but not so well in most other regions. This was also true for the Gamecube, though not as badly split.
Here, we seem to just want those AAA first party titles; "Gimme Mario, gimme Metroid, gimme Zelda!". Sunshine IMHO was fantastic and definitely a AAA title but it was so damn different that many had a bias against it and never gave it the time it was due because of that. Accordingly the Gamecube suffered in sales and the Very different Wind Waker that I still can't stop hearing the whining about. Personally I LOVED Wind Waker.
The Wii sold because there was a Zelda game and the price was low on launch... That is basically what drove the Wii sales for at least a year or maybe more. Most 3rd party games were shit and still are but what console could a 79 year old great grandmother and a 6 year old great grandson play the same game together? I have never seen one other than the Wii. The Wii-U is still kind of running off the Wii's steam right now, and that's good! The console sales are still better than most launches and definitely better than some of Nintendo older offerings after the venerable SNES.
Mario and other first party titles like them do drive sales of the consoles but also sell GAMES. We all know the game companies don't make the real money off the hardware, at least at first: it's the sales of licenses for the GAMES that make real money.
Here is my theory. Give me a team of a dozen guys and I will annually release a new NSMB type title because they are simple as hell and sell like mad. Twice per console cycle release a MAIN Mario title like SMW, SMG etc this will keep the console going while the third parties finally start to directly support the system. This is as most third parties hold off until they know for fact that the console will sell enough units to make their efforts worthwhile. For an example of how NOT to do the PSVita is a great one; even if Nintendo has to rehash Wind Waker and all that stuff for a year or two before the console really takes the so be it, that is just how ALL consoles work. For example games for the 360 were shit on a raping stick terrible for at LEAST two years, the PS3 took more like one year (which given release window differences...) but the formula remains the same.
Part of the reason the Wii-U is not selling like the Wii did is price and not having the same AAA Zelda or Mario title at launch and 170+ bucks for a second Wii-U pad is simply outside the price range of most of the poor people in the world. The Wii lacked this and did better for it; Mommy and Daddy go to Walmart and see a 500+ dollar PS3, a 400+ dollar 360 and the Wii is 200+ and comes with a game so of course it sold well. However the Wii-U is just not that machine, it seems nice and all but THAT is what made Nintendo top dog again. At least in revenue, most people had a PS3 and a Wii or a 360 and a Wii (the Wii60 or PSWii).
The Wii-U is a replacement for the main console and I hope Nintendo does it right this time and we don't have another Gamecube (even though I LOVED my Gamecube).
Anyways, that's my 2 cents